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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
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+<sect2 id="calc-precess">
+<title>Precession module</title>
+<indexterm><primary>Tools</primary>
+<secondary>Astrocalculator</secondary>
+<tertiary>Precession module</tertiary>
+</indexterm>
+
+<screenshot>
+<screeninfo>
+The Precession calculator module
+</screeninfo>
+<mediaobject>
+ <imageobject>
+ <imagedata fileref="calc-precess.png" format="PNG"/>
+ </imageobject>
+ <textobject>
+ <phrase>Precession</phrase>
+ </textobject>
+</mediaobject>
+</screenshot>
+
+<para>
+This module is similar to the <link linkend="calc-apcoords">Apparent
+Coordinates module</link>, but it only applies the effect of
+<link linkend="ai-precession">precession</link>, not of nutation or
+aberration.
+</para>
+<para>
+To use the module, first enter the input coordinates and their epoch
+in the <guilabel>Original Coordinates</guilabel> section. You must
+also fill in the target epoch in the <guilabel>Precessed
+Coordinates</guilabel> section. Then, press the
+<guibutton>Compute</guibutton> button, and the object's
+coordinates, precessed to the target Epoch, are presented in the
+<guilabel>Precessed Coordinates</guilabel> section.
+</para>
+</sect2>